http://i111.photobucket.com/albums/n151/southern1inla/2012%20boxes/photo.jpg
Not much of the actual build, but here it is about half way thru.
http://i111.photobucket.com/albums/n151/southern1inla/2012%20boxes/photo2.jpg
The BEST way to glue carpet to a box. HFLP latex spray gun and WoodWeld contact cement.
On of these Kobalt guns usually lasts me about 6-8months, then the WoodWeld pretty much kills it. I toss it in the trash and go buy another one. By that time the gun has FAR MORE THAN PAID FOR ITSELF.
http://i111.photobucket.com/albums/n151/southern1inla/2012%20boxes/photo3.jpg
Trimmed back the carpet to the corners, spray a nice coat of contact cement on both the box and carpet.
http://i111.photobucket.com/albums/n151/southern1inla/2012%20boxes/photo4.jpg
Overlap the carpet, cut, put the seam together.
http://i111.photobucket.com/albums/n151/southern1inla/2012%20boxes/photo6.jpg
Final seam on this end of the box.
http://i111.photobucket.com/albums/n151/southern1inla/2012%20boxes/photo7.jpg
Play where's waldo w/ the seams.

Now...on to something I have not seen anyone post pics of. I don't just cut the carpet around the port. When I router my ports, I counter sink the bit into the wood a little to allow for a little lip. (I know others do this to, I just have not seen it posted here)